ed nearly all of the continents and extended north of the equator would be required. Geologists have found no evidence of glacial action in the northern hemisphere during this time period. In fact, during this time period, the climate in North America was warm. Wegener proposed that the continents were adjacent to each other during the glacial event. Therefore, glaciers spread over a much smaller area in the southern hemisphere and probably did not influence the climate of the northern hemisphere. Wegener used the distribution of specific rock types to determine the distribution of climate zones in the geologic past. For example, glacial till and striations, sand dunes, and coral reefs, indicate polar, desert, and tropical climates, respec
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